A system for mitigating pyrolysis heat supply coking

Abstract

The application relates to a system for slowing pyrolysis heat supply coking, belongs to the technical field of coal dry distillation, and comprises a coal bunker, a drying chamber, a dry distillation chamber and a cooling chamber connected in sequence, a cooling loop is connected between the dry distillation chamber and the cooling chamber, a condensation oil removal device is arranged on the cooling loop, a first drying loop is connected between the cooling chamber and the drying chamber, a heating loop is connected between the drying chamber and the dry distillation chamber, a cooler and a first heat exchanger are sequentially arranged on the heating loop, a combustion loop is connected between the cooler and the first heat exchanger, a hot blast furnace is arranged on the combustion loop, an air branch is connected to the hot blast furnace, and the hot blast furnace provides high-temperature flue gas to the first heat exchanger. The application has the effect that impurities in pyrolysis gas cannot easily affect the normal work of the hot blast furnace and the first heat exchanger.

Description

Technical Field

[0001] This application relates to the technical field of coal dry distillation, and in particular to a system for mitigating coking caused by pyrolysis heating. Background Technology

[0002] Coal produces pyrolysis gas in the dry distillation section. In order to reduce the energy consumption of coal pyrolysis and improve the utilization rate of pyrolysis gas, the pyrolysis gas is usually divided into three parts after condensation and oil removal. The first part of the pyrolysis gas is sent out for use. The second part of the pyrolysis gas is used to generate high-temperature flue gas in the hot blast furnace. The third part of the pyrolysis gas and the high-temperature flue gas are exchanged with each other in a heat exchanger and then reintroduced into the dry distillation section to provide heat for the pyrolysis of coal.

[0003] The pyrolysis gas after condensation and oil removal still contains impurities such as tar, crude benzene, and light hydrocarbons. These impurities will adhere to the furnace wall of the hot blast stove and the tube wall of the heat exchanger. Under high temperature conditions, the tar and crude benzene will carbonize and coke, which can easily affect the normal operation of the hot blast stove and heat exchanger. Utility Model Content

[0004] In order to prevent impurities in the pyrolysis gas from affecting the normal operation of the hot blast stove and heat exchanger, this application provides a system for mitigating coking during pyrolysis heating.

[0005] This application provides a system for mitigating coking during pyrolysis heating, employing the following technical solution: A system for mitigating coking during pyrolysis heating includes a coal bunker, a drying chamber, a pyrolysis chamber, and a cooling chamber connected in sequence. A cooling circuit is connected between the pyrolysis chamber and the cooling chamber, and a condensation and oil removal device is installed on the cooling circuit. A first drying circuit is connected between the cooling chamber and the drying chamber. A heating circuit is connected between the drying chamber and the pyrolysis chamber. A cooler and a first heat exchanger are installed in sequence on the heating circuit. A combustion circuit is connected between the cooler and the first heat exchanger. A hot air furnace is installed on the combustion circuit, and an air branch is connected to the hot air furnace. The hot air furnace supplies high-temperature flue gas to the first heat exchanger.

[0006] Optionally, a second drying circuit is connected between the first heat exchanger and the drying chamber.

[0007] Optionally, a third drying circuit is connected between the cooler and the drying chamber.

[0008] Optionally, a second heat exchanger is provided on the combustion circuit, and the pyrolysis gas in the combustion circuit first passes through the second heat exchanger before entering the hot blast furnace.

[0009] Optionally, a preheating circuit is connected between the second heat exchanger and the first heat exchanger. The preheating circuit is used to allow the high-temperature flue gas after heat exchange to pass to the second heat exchanger.

[0010] Optionally, a first cyclone dust collector is provided on the first drying circuit.

[0011] Optionally, a second cyclone dust collector is provided on the heating circuit, and the pyrolysis gas first passes through the second cyclone dust collector and then through the cooler.

[0012] Optionally, a first external supply branch is connected to the cooling circuit between the condensation oil removal device and the cooling chamber.

[0013] In summary, this application includes at least one of the following beneficial technical effects: This application discloses a system for mitigating coking during pyrolysis heating, comprising a coal bunker, a drying chamber, a carbonization chamber, a cooling chamber, a cooling circuit, a first drying circuit, a heating circuit, and a combustion circuit. The pyrolysis gas generated in the carbonization chamber passes sequentially through the cooling chamber and the drying chamber, and is then heated with the assistance of a hot blast stove and a first heat exchanger. The coke in the cooling chamber and the coal in the drying chamber filter the pyrolysis gas, reducing the content of impurities such as tar and crude benzene in the pyrolysis gas. This prevents these impurities from adhering to the hot blast stove and the first heat exchanger, thus minimizing their impact on the normal operation of the hot blast stove and the heat exchanger. During filtration, the pyrolysis gas cools the coke in the cooling chamber and dries the coal in the drying chamber. Attached Figure Description

[0014] Figure 1 This is a structural schematic diagram of an embodiment of this application.

[0015] Explanation of reference numerals in the attached figures: 1. Coal bunker; 2. Drying chamber; 3. Distillation chamber; 4. Cooling chamber; 5. Cooling circuit; 501. Condensation and oil removal device; 502. First external supply branch; 6. First drying circuit; 601. First cyclone dust collector; 7. Heating circuit; 701. Cooler; 702. First heat exchanger; 703. Second cyclone dust collector; 8. Combustion circuit; 801. Hot air furnace; 802. Air branch; 803. Second heat exchanger; 804. Second external supply branch; 9. Second drying circuit; 10. Third drying circuit; 11. Preheating circuit. Detailed Implementation

[0016] The following is in conjunction with the appendix Figure 1 This application will be described in further detail.

[0017] This application discloses a system for mitigating coking during pyrolysis heating. (Refer to...) Figure 1 A system for mitigating coking caused by pyrolysis heating includes a coal bunker 1, a drying chamber 2, a dry distillation chamber 3, and a cooling chamber 4 connected in sequence. The coal bunker 1 is used to store coal, and the coal passes through the drying chamber 2, the dry distillation chamber 3, and the cooling chamber 4 in sequence from the coal bunker 1 to form coking coal.

[0018] A cooling circuit 5 is connected between the dry distillation chamber 3 and the cooling chamber 4. A condensation and oil removal device 501 is installed on the cooling circuit 5. The pyrolysis gas generated in the dry distillation chamber 3 is introduced into the cooling chamber 4 through the cooling circuit 5. The condensation and oil removal device 501 removes oil from the pyrolysis gas and lowers its temperature. The cooled pyrolysis gas can then cool the coking coal in the cooling chamber 4.

[0019] A first drying circuit 6 is connected between the cooling chamber 4 and the drying chamber 2. The pyrolysis gas passing through the cooling chamber 4 is heated and then introduced into the drying chamber 2 to dry the coal in the drying chamber 2. During the process of the pyrolysis gas passing through the cooling chamber 4 and the drying chamber 2, both coking coal and coal can filter out impurities such as tar and crude benzene and light hydrocarbons carried in the pyrolysis gas, so as to reduce the content of impurities such as tar and crude benzene and light hydrocarbons in the pyrolysis gas.

[0020] A heating circuit 7 is connected between the drying chamber 2 and the dry distillation chamber 3. A cooler 701 and a first heat exchanger 702 are sequentially installed on the heating circuit 7. The cooler 701 removes the moisture carried in the pyrolysis gas. The pyrolysis gas, after the moisture is removed, is heated again at the first heat exchanger 702. The heated pyrolysis gas can be introduced into the dry distillation chamber 3 to provide heat for coal pyrolysis.

[0021] A combustion circuit 8 is connected between the cooler 701 and the first heat exchanger 702. A hot air furnace 801 is installed on the combustion circuit 8. An air branch 802 is connected to the hot air furnace 801. The hot air furnace 801 provides high-temperature flue gas to the first heat exchanger 702. Air is introduced into the hot air furnace 801 through the air branch 802. The pyrolysis gas is introduced into the hot air furnace 801 and mixes with the air for combustion, generating high-temperature flue gas. The high-temperature flue gas can be introduced into the first heat exchanger 702 as a heat source to exchange heat with the pyrolysis gas in the heating circuit 7.

[0022] The temperature range of the high-temperature flue gas is 500-600℃.

[0023] In operation, the pyrolysis gas first passes through the cooling chamber 4, then the drying chamber 2, and after being heated by heat exchange, it enters the dry distillation chamber 3. The coke and coal filter the pyrolysis gas, reducing the content of impurities such as tar and crude benzene and light hydrocarbons. This prevents these impurities from adhering to the walls of the hot blast stove 801 and the tube walls of the first heat exchanger 702. Therefore, under the high-temperature environment of the hot blast stove 801 and the first heat exchanger 702, the purified pyrolysis gas is less likely to affect the normal operation of these systems. Furthermore, the pyrolysis gas also cools the coke and dries the coal.

[0024] Reference Figure 1In order to improve the drying effect in the drying chamber 2, a second drying circuit 9 is connected between the first heat exchanger 702 and the drying chamber 2; a portion of the pyrolysis gas heated by the first heat exchanger 702 is introduced into the drying chamber 2, which increases the pyrolysis gas content in the drying chamber 2 and improves the drying effect in the drying chamber 2.

[0025] Reference Figure 1 In order to adjust the drying temperature in the drying chamber 2, a third drying circuit 10 is connected between the cooler 701 and the drying chamber 2. The pyrolysis gas after cooling and dehydration is introduced into the drying chamber 2 together with the pyrolysis gas in the first drying circuit 6 and the second drying circuit 9. The cooled pyrolysis gas can reduce the temperature of the pyrolysis gas in the first drying circuit 6 and the second drying circuit 9. Therefore, by adjusting the amount of pyrolysis gas in the third drying circuit 10, the drying temperature of the pyrolysis gas in the drying chamber 2 can be controlled to prevent the coal in the drying chamber 2 from pyrolyzing due to excessive drying temperature.

[0026] Reference Figure 1 In order to facilitate the combustion of pyrolysis gas in the hot blast furnace 801, a second heat exchanger 803 is provided on the combustion circuit 8. The pyrolysis gas in the combustion circuit 8 first passes through the second heat exchanger 803 before entering the hot blast furnace 801. The second heat exchanger 803 heats the pyrolysis gas to preheat it, and the heated pyrolysis gas is more likely to be combusted in the hot blast furnace 801.

[0027] Reference Figure 1 In order to make more efficient use of high-temperature flue gas, a preheating circuit 11 is connected between the second heat exchanger 803 and the first heat exchanger 702. The preheating circuit 11 is used to allow the high-temperature flue gas after heat exchange to pass to the second heat exchanger 803.

[0028] The second heat exchanger 803 is connected to a second external transmission branch 804 so that the waste heat of the high-temperature flue gas can be transmitted and utilized.

[0029] The preheating circuit 11 allows the high-temperature flue gas after heat exchange to be introduced into the second heat exchanger 803 to preheat the pyrolysis gas, making full use of the waste heat of the high-temperature flue gas.

[0030] Reference Figure 1 In order to remove the dust carried by the pyrolysis gas after passing through the cooling chamber 4, a first cyclone dust collector 601 is installed on the first drying circuit 6. The first cyclone dust collector 601 removes dust from the pyrolysis gas so that the pyrolysis gas does not easily carry dust into the drying chamber 2.

[0031] Reference Figure 1In order to remove the dust carried by the pyrolysis gas after passing through the drying chamber 2, a second cyclone dust collector 703 is installed on the heating circuit 7. The pyrolysis gas first passes through the second cyclone dust collector 703 and then passes through the cooler 701. The second cyclone dust collector 703 removes dust from the pyrolysis gas so that the pyrolysis gas does not easily carry dust into the cooler 701.

[0032] In order to improve the utilization rate of pyrolysis gas, a first external delivery branch 502 is connected to the cooling circuit 5 between the condensation and oil removal device 501 and the cooling chamber 4; the remaining pyrolysis gas can be delivered for external use through the first external delivery branch 502, thereby improving the utilization rate of pyrolysis gas.

[0033] The implementation principle of the system for mitigating coking during pyrolysis heating according to an embodiment of this application is as follows: During use, the pyrolysis gas in the dry distillation chamber 3 is condensed and deoiled before being introduced into the cooling chamber 4. The pyrolysis gas cools the coke, and the coke filters the pyrolysis gas. The pyrolysis gas in the cooling chamber 4 is then introduced into the drying chamber 2, where it dries the coal. The coal filters the pyrolysis gas, reducing the content of impurities such as tar and crude benzene and light hydrocarbons in the pyrolysis gas. This makes it less likely that impurities such as tar and crude benzene and light hydrocarbons will adhere to the hot blast stove 801 and the first heat exchanger 702 when the pyrolysis gas is working. As a result, the impurities in the pyrolysis gas are less likely to affect the normal operation of the hot blast stove 801 and the first heat exchanger 702.

[0034] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A system for mitigating coking during pyrolysis heating, characterized in that: The system includes a coal bunker (1), a drying chamber (2), a dry distillation chamber (3), and a cooling chamber (4) connected in sequence. A cooling circuit (5) is connected between the dry distillation chamber (3) and the cooling chamber (4). A condensation and oil removal device (501) is installed on the cooling circuit (5). A first drying circuit (6) is connected between the cooling chamber (4) and the drying chamber (2). A heating circuit (7) is connected between the drying chamber (2) and the dry distillation chamber (3). A cooler (701) and a first heat exchanger (702) are installed in sequence on the heating circuit (7). A combustion circuit (8) is connected between the cooler (701) and the first heat exchanger (702). A hot air furnace (801) is installed on the combustion circuit (8). An air branch (802) is connected to the hot air furnace (801). The hot air furnace (801) supplies high-temperature flue gas to the first heat exchanger (702).

2. The system for mitigating coking during pyrolysis heating according to claim 1, characterized in that: A second drying circuit (9) is connected between the first heat exchanger (702) and the drying chamber (2).

3. The system for mitigating coking during pyrolysis heating according to claim 2, characterized in that: A third drying circuit (10) is connected between the cooler (701) and the drying chamber (2).

4. The system for mitigating coking during pyrolysis heating according to claim 1, characterized in that: The combustion circuit (8) is equipped with a second heat exchanger (803). The pyrolysis gas in the combustion circuit (8) first passes through the second heat exchanger (803) and then enters the hot blast furnace (801).

5. The system for mitigating coking during pyrolysis heating according to claim 4, characterized in that: A preheating circuit (11) is connected between the second heat exchanger (803) and the first heat exchanger (702). The preheating circuit (11) is used to allow the high-temperature flue gas after heat exchange to pass to the second heat exchanger (803).

6. The system for mitigating coking during pyrolysis heating according to claim 1, characterized in that: The first drying circuit (6) is equipped with a first cyclone dust collector (601).

7. The system for mitigating coking during pyrolysis heating according to claim 1, characterized in that: The heating circuit (7) is equipped with a second cyclone dust collector (703), and the pyrolysis gas first passes through the second cyclone dust collector (703) and then through the cooler (701).

8. The system for mitigating coking during pyrolysis heating according to claim 1, characterized in that: The cooling circuit (5) between the condensation and oil removal device (501) and the cooling chamber (4) is connected to a first external branch (502).

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